Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 39,365	$ 21,430
Restricted cash and equivalents	5,765	5,555
Accounts receivable, net	477,089	508,192
Materials, supplies and fuel	129,960	207,421
Derivative assets, current	153	582
Income tax receivable, net	17,772	17,637
Regulatory assets, current	214,838	260,312
Other current assets	33,376	50,579
Total current assets	918,318	1,071,708
Property, plant and equipment	8,466,173	8,374,790
Less accumulated depreciation and depletion	(1,628,772)	(1,576,842)
Total property, plant and equipment, net	6,837,401	6,797,948
Other assets:
Goodwill	1,299,454	1,299,454
Intangible assets, net	9,296	9,589
Regulatory assets, non-current	347,031	392,669
Other assets, non-current	48,636	46,862
Total other assets, non-current	1,704,417	1,748,574
TOTAL ASSETS	9,460,136	9,618,230
Current liabilities:
Accounts payable	173,221	310,020
Accrued liabilities	228,861	243,457
Derivative liabilities, current	1,729	6,600
Regulatory liabilities, current	110,100	46,013
Notes payable	0	535,600
Current maturities of long-term debt	525,000	525,000
Total current liabilities	1,038,911	1,666,690
Long-term debt, net of current maturities	3,954,409	3,607,340
Deferred credits and other liabilities:
Deferred income tax liabilities, net	535,852	508,941
Regulatory liabilities, non-current	466,961	472,560
Benefit plan liabilities	117,765	116,742
Other deferred credits and other liabilities	154,507	156,062
Total deferred credits and other liabilities	1,275,085	1,254,305
Commitments, contingencies and guarantees (Note 3)
Equity:
Common stock $1 par value; 100,000,000 shares authorized; issued 66,670,709 and 66,140,396 shares, respectively	66,671	66,140
Additional paid-in capital	1,911,476	1,882,653
Retained earnings	1,136,844	1,064,122
Treasury stock, at cost - 41,114 and 36,726 shares, respectively	(2,697)	(2,435)
Accumulated other comprehensive income (loss)	(14,347)	(15,567)
Total stockholders’ equity	3,097,947	2,994,913
Non-controlling interest	93,784	94,982
Total equity	3,191,731	3,089,895
TOTAL LIABILITIES AND TOTAL EQUITY	$ 9,460,136	$ 9,618,230